Vulnerability Monitor

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CVE-2021-40906


CheckMK Raw Edition software (versions 1.5.0 to 1.6.0) does not sanitise the input of a web service parameter that is in an unauthenticated zone. This Reflected XSS allows an attacker to open a backdoor on the device with HTML content and interpreted by the browser (such as JavaScript or other client-side scripts) or to steal the session cookies of a user who has previously authenticated via a man in the middle. Successful exploitation requires access to the web service resource without authentication.


Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.1, indicating it can be exploited remotely over the network with relatively low complexity though user interaction is required and does not require pre-existing privileges . The vulnerability impacts limited data confidentiality, limited integrity, for affected systems. Impacting 2 products from checkmk, from tribe29 organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2022, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.


Published

2022-03-25T23:15:08.287

Last Modified

2024-11-21T06:25:04.797

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.1 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:P/A:N

  • Access Vector: NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: NONE
  • Integrity Impact: PARTIAL
  • Availability Impact: NONE
Exploitability Score

8.6

Impact Score

2.9

Weaknesses
  • Type: Primary
    CWE-79

Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application checkmk checkmk < 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application checkmk checkmk 1.6.0 Yes
Application tribe29 checkmk 1.6.0b10 Yes
Application tribe29 checkmk 1.6.0b11 Yes
Application tribe29 checkmk 1.6.0p10 Yes
Application tribe29 checkmk 1.6.0p17 Yes
Application tribe29 checkmk 1.6.0p18 Yes

References

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For checkmk's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.